Buried beneath a Michigan farmer’s soy field were the butchered remains of a woolly mammoth. Paleontologists think that the skull, tusks, jaws and other parts that they uncovered on Thursday were stored there by early humans in a primitive fridge more than 10,000 years ago.

Last Monday James Bristle, the farmer, came across what he thought was a fence post while digging in his yard, only to discover that it was actually a rib, according to The Ann Arbor News. He contacted researchers from the University of Michigan to investigate, and together they unearthed the prehistoric beast.

Daniel Fisher, a paleontologist who led the dig, said the mammoth most likely roamed the area 11,700 to 15,000 years ago, and was around 40 years old when it died.

In addition to the skull and tusks, the team also recovered vertebrae, a pelvis, shoulder blade pieces and one kneecap. Missing from the find were most of the mammoth’s fore and hind limbs, which the team presumed were either buried elsewhere or had already been eaten.

Dr. Fisher said that ancient humans most likely preserved the mammoth parts in a pond to eat later. The team found clues such as stone tool fragments and three large boulders, which they think were used as anchors, near the bones to support their hypothesis. According to the researchers, the findings might provide insight into when humans first settled and hunted in present-day Michigan.